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2 years ago

Jane has 60 liters of 70% of acid solution. How many liters of water must be added to form a solution that is 40% acid?

1 answer:

4 0

Let w = liters of water needed
4.70= acid in 40% solution

4.70/70+w = .28

28=.28.(70+w)
70+w=100
w=30

30 liters of water is needed

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Which is larger 1 1/2 or 1 15/16

solniwko [45]

Hi there!

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I believe your answer is:

1 (15/16)

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Here’s why:

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Hope this helps you. I apologize if it’s incorrect.

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Answer:

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Step-by-step explanation:

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2 years ago

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MArishka [77]

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3 years ago

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A geologist examines 6 seawater samples for lead concentration. The mean lead concentration for the sample data is 0.903 cc/cubi

Gnesinka [82]

Answer:

Step-by-step explanation:

We want to determine a 95% confidence interval for the mean lead concentration of sea water samples

Number of samples. n = 6

Mean, u = 0.903 cc/cubic meter

Standard deviation, s = 0.0566

For a confidence level of 95%, the corresponding z value is 1.96. This is determined from the normal distribution table.

We will apply the formula

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= mean +/- z ×standard deviation/√n

It becomes

0.903 +/- 1.96 × 0.0566/√6

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The upper end of the confidence interval is 0.903 + 0.045 =0.948

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2 years ago

Find the derivative of f(x)= e^(4x) + e^-(4x)

ololo11 [35]

Answer:

$f'(x)=4e^{4x} -4e^{-4x}$

Step-by-step explanation:

To find this derivative, we will need to use the chain rule.

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